Measurement of the [Formula: see text] production cross-section in proton-proton collisions via the decay [Formula: see text]. - Aaij R; Beteta CA; Adeva B; Adinolfi M; Affolder A; Ajaltouni Z; Akar S; Albrecht J; Alessio F; Alexander M; Ali S; Alkhazov G; et al. (The European physical journal. C, Particles and fields, 2015)